Heat-sensitive composition in which removal of the unexposed regions is unnecessary, negative lithographic plate coated with the said composition and method for forming a negative image on the said plate
a composition and heat-sensitive technology, applied in the field of heat-sensitive compositions, can solve the problems of high energy required to form images, low productivity, and inacceptable plates for the graphic arts industry, and achieve the effect of low energy
Inactive Publication Date: 2004-04-01
AGFA NV
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- Abstract
- Description
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- Application Information
AI Technical Summary
Benefits of technology
[0017] A first object of this invention is to provide a heat-sensitive composition, the composition being such that the image-forming stage requires low energy, forms an image without the removal of material and requires no developing treatment after the stage of exposure to IR radiation.
Problems solved by technology
This does however have the disadvantage that it requires the application of high energy in order to form the image.
In addition to the expenditure of energy, this means that the machine must be used at low speed, with consequent low productivity.
This makes such a plate unacceptable for the graphic arts industry.
Another disadvantage of the aforesaid composition is that the heat-switchable binder which it contains is not stable over time.
Method used
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Examples
Experimental program
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Effect test
examples 16-46
Lithographic Plates
[0090] The compositions in Examples 1-15 above were spread on to
[0091] A) degreased aluminum, and
[0092] B) aluminum electrochemically grained, subjected to anodic oxidation and treated with a solution of polyvinyl phosphonic acid.
[0093] The plates coated in this way were dried in a hot-air furnace (PID System M80-VF from the company MPM Instruments s.r.l., Bernareggio, Milan, Italy) at 85.degree. C. for 8 minutes. The weight of the photosensitive coating lay between 2.5 and 4.0 g / m.sup.2.
[0094] The plates so obtained are listed in Table 5 below.
5TABLE 5 Composition Substrate Plate Code 1 A A1 1 B B1 2 A A2 2 B B2 3 A A3 3 B B3 4 A A4 4 B B4 5 A A5 5 B B5 6 A A6 6 B B6 7 A A7 7 B B7 8 A A8 8 B B8 9 A A9 9 B B9 10 A A10 10 B B10 11 A A11 11 B B11 12 A A12 12 B B12 13 A A13 13 B B13 14 A A14 14 B B14 15 A A15 15 B B15
[0095] After being allowed to stand for at least 24 hours, the plates were subjected to the following Tests.
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Abstract
A heat-sensitive composition which forms an image without the removal of material, which does not require any developing treatment after the stage of exposure to heat and comprises: (a) a switchable polymer, (b) an IR absorber, (c) a triazine compound, and (d) a novolak resin. Negative lithographic plate comprising a substrate coated with the said composition. A method for obtaining a negative image on a substrate coated with a composition which is first hydrophilic and then lipophilic after exposure to heat, without the removal of material, the said negative image being obtained by applying a small quantity of energy to the said composition.
Description
[0001] This application is based on European Patent Application No. 02425455.9 filed on Jul. 10, 2002, the content of which is incorporated hereinto by reference.[0002] This invention relates to a heat-sensitive composition in which removal of the unexposed regions is unnecessary, a negative lithographic plate coated with the said composition and a method for forming a negative image on the said plate.[0003] In particular it relates to a heat-sensitive composition which during exposure to heat does not involve the ablation of exposed regions by vaporization and which after the stage of exposure to heat does not involve removal of the unexposed regions with a developer bath, thus making it possible to proceed directly from the exposure stage to the printing stage.[0004] Even more particularly, this invention relates to a composition in which the image-forming stage requires low energy and in which the affinity of the unexposed regions for water and the affinity of the exposed regions...
Claims
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Login to View More IPC IPC(8): B41C1/10G03F7/004B41N1/14C09K3/00G03F7/00G03F7/022G03F7/033
CPCB41C1/1041Y10S430/165Y10S430/145Y10S430/146G03F7/022
Inventor BOLLI, ANGELOTETTAMANTI, ANDREA
Owner AGFA NV